Seacock Components And Functions (Optional); Seacock Precautions; Inspecting The Seacock - Yanmar 6LY3 series Service Manual

Seacock Components and Functions (Optional)

12/05
SEACOCK COMPONENTS AND
FUNCTIONS (OPTIONAL)
The seacock, installed on the bottom of the hull
(Figure 7-22, (2)), controls the intake of seawater
into the boat. The seacock serves to filter the
seawater so that mud, sand and other foreign
matter does not enter the seawater pump.
Figure 7-22
(2)
(1)
Figure 7-22
1 – Suction Hose
2 – Hull
3 – Cock
4 – Seacock Cover
5 – Bolt
6 – Scoop Strainer
7 – Bolt
Numerous holes are drilled into the water side of
the seacock and a scoop strainer is installed to
prevent debris from entering the system.
6LY3 Service Manual
(3)
(4)
(5)
(6)
(7)
0006219
© 2007 Yanmar Marine International

Seacock Precautions

Always close the seacock after each day of use and
confirm that it is open before the beginning of the
next day of operation.
If the seacock is left open, seawater will flow in
reverse and the vessel will sink if trouble occurs
with the water pump.
If the engine is operated with the seacock closed,
coolant will not be able to get in, resulting in engine
and pump trouble.

Inspecting the Seacock

When the seawater volume has dropped and the
water pump is normal, inspect the seacock. The
vessel must be removed from the water to check for
clogging and to inspect the seacock.
If water leaks from the seacock, disassemble and
inspect for wear. If any damage is found, repair or
replace the seacock.
COOLANT SYSTEM
7-19